Start in Target disk mode and is dead

I put my macbook pro in target disk mode for boot another power book from firewire, he asked me for restart, and now dosent start. Is dead. Nothing respond. What to do? HELP

Strange. It's one of the graphite colored boxes. I bought it as a G4. Maybe they used G3 motherboards for the early G4s. I tried using my iBook in target disk mode and mounting it on the old G4 desktop, then selecting the installation DVD as the startup disk. The machine booted into OS 9, but the iBook's drives mounted. I guess this model has no support for target disk mode and it can't even boot from a target disk.

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